Electronic Components Datasheet Search |
|
HFA3600 Datasheet(PDF) 13 Page - Intersil Corporation |
|
HFA3600 Datasheet(HTML) 13 Page - Intersil Corporation |
13 / 16 page 13 optimum performance and tight distribution among production lots. The open collector output permits direct interface to moderate impedance IF filters as well as 50W input filters after a simple “L” impedance matching network. A collector resistor of 1K has been used throughout the characterization together with an impedance matching network for 50W load measurements. With a low -3dBm LO level, a typical SSB noise figure of 12.1dB, conversion gain of 7.0dB and a third order output intercept point of +3.2dBm are the main features. The LO input return loss is typically of 26dBm and the RF input return loss has a typical value of 11dB. Bias Network and Power Down The Bias Network is responsible for the accurate setting of both LNA and MIXER operating currents. The LNA operating current is accurately set to 5mA while the MIXER is set to 4mA. Laser trimming procedures and a temperature independent performance of the bias cell, assure the worst case operating current variation of the LNA and MIXER of 1% over the operating temperature range. The Bias network is powered by the Mixer VCC pin and has a built in feature of disabling both the LNA and the MIXER stages. The cell can be powered up and down within 10ms. Power down total current consumption is in the order of 250mA. The simplified schematic of the power down input circuit is shown below. Low Voltage Operation Low voltage operation is possible with the HFA3600. The HFA3600 has been characterized with VCC of 4V and only moderate degradations have been observed compared to the AC performance at a VCC of 5V. The LNA gain shows a 0.8dB decrease and a 1.5dB degradation in the output intercept point with no measurable impact on noise figure. The MIXER behavior at 4V can be summarized with a degradation of conversion gain and output intercept point of 0.8dB and a slight improvement in noise figure of 0.6dB. Other relevant 4V performance characteristics include: • Total ICC: typical drop of 2.2mA • LNA Input Return Loss: degraded by 0.6dB • LNA Reverse Isolation: degraded by 1dB • LNA Output Return Loss: degraded by 1dB • RF to IF Isolation: no change • LOin to LNAin Isolation: improvement by 2dB • LNAOUT to Mixer RFIN Isolation: improvement by 0.2dB • Mixer LO to RF Isolation: no change • Mixer LO to IF Isolation: degrades by 0.5dB • Mixer RF input Return Loss: degrades by 1dB • Mixer LO Input Return Loss: degrades by 0.3dB at 800MHz and 1dB at 700MHz Layout Considerations The HFA3600 evaluation board layout has been carefully designed for an accurate RF characterization of the device. 50 Ω microstrip lines have been provided to permit the connection of the LNA and MIXER independently and facilitate the user interface for testing. Top ground planes were used to assure adequate isolation between critical traces. The HA3600 package pinout has been laid out for best isolation and overall device performance which also permits the placement and connection of ground planes at pins 2, 4, 5, 10 and 12. Pin 4 and Pin 5 assure a low impedance ground return for the LNA and also helps the isolation between the LNA input and the LO input. The LNA output pin is isolated from the RF input port with a good ground connection between the top and back ground planes terminated at pin 10. A series of plated through holes resembling a stitch pattern are sufficient and important for the LNA-OUT and RF-IN ports isolation, so the designer can rely on the full characteristics of rejection of the image filter. Similar isolation pattern is drawn and terminated in pin 12 to isolate the RF-IN from the IF-OUT port. A ground pad has been laid down beneath the package with a series of plated through holes to minimize the inductance to the ground plane and improve the device gain characteristics. All device grounds must be connected as close to the package as possible and the same applies to both VCC inputs and all VCC bypass capacitors. A small 4.7µF tantalum capacitor at the VCC line will prevent supply coupling to the bias network if the device is subjected to strong low frequency interference signals. A protection diode has been added to the demonstration board for extra protection and is not needed in an actual application. MIXER VCC 10K 100K PD 15K FIGURE 35. ENABLE PIN INPUT CIRCUIT HFA3600 |
Similar Part No. - HFA3600 |
|
Similar Description - HFA3600 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |